protected override unsafe void ProcessFilter( UnmanagedImage source, UnmanagedImage destination )
{
int pixelSize = Image.GetPixelFormatSize( source.PixelFormat ) / 8;
// image width and height
int width = source.Width;
int height = source.Height;
int widthToProcess = Math.Min( width, warpMap.GetLength( 1 ) );
int heightToProcess = Math.Min( height, warpMap.GetLength( 0 ) );
int srcStride = source.Stride;
int dstStride = destination.Stride;
int dstOffset = dstStride - widthToProcess * pixelSize;
// new pixel's position
int ox, oy;
byte* src = (byte*) source.ImageData.ToPointer( );
byte* dst = (byte*) destination.ImageData.ToPointer( );
byte* p;
// for each line
for ( int y = 0; y < heightToProcess; y++ )
{
// for each pixel
for ( int x = 0; x < widthToProcess; x++ )
{
// get original pixel's coordinates
ox = x + warpMap[y, x].X;
oy = y + warpMap[y, x].Y;
// check if the random pixel is inside of image
if ( ( ox >= 0 ) && ( oy >= 0 ) && ( ox < width ) && ( oy < height ) )
{
p = src + oy * srcStride + ox * pixelSize;
for ( int i = 0; i < pixelSize; i++, dst++, p++ )
{
*dst = *p;
}
}
else
{
for ( int i = 0; i < pixelSize; i++, dst++ )
{
*dst = 0;
}
}
}
// copy remaining pixel in the row
if ( width != widthToProcess )
{
AForge.SystemTools.CopyUnmanagedMemory( dst, src + y * srcStride + widthToProcess * pixelSize, ( width - widthToProcess ) * pixelSize );
}
dst += dstOffset;
}
// copy remaining rows of pixels
for ( int y = heightToProcess; y < height; y++, dst += dstStride )
{
AForge.SystemTools.CopyUnmanagedMemory( dst, src + y * srcStride, width * pixelSize );
}
}
}
